Tripolar division (VIDEO) Johns Hopkins University This video is under embargo. Please login to access this video. Caption VIDEO: A time lapse clip of a common type of abnormal cell division where an embryo cleaves directly from a single-celled zygote into three (rather than two) cells. The new research shows such abnormal division is strongly associated with chromosome abnormalities and embryo arrest. Credit Christian Ottolini Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.